We have recently upgraded from 220.127.116.11 to 18.104.22.168 in our development setup but now we are facing some issue so now we need to degrade to 22.214.171.124 while searching in internet I found below link where it says uninstalling CFP is not possible.
Please guide whether can we perform or not.
Per my knowledge, there is no way to downgrade/remove SP & CFP. You must keep a backup of your existing setup. The only solution is to setup 126.96.36.199 again from scratch and port your code/content/configurations from 188.8.131.52 as applicable.
You may open daycare ticket and ask for recommendations.
The official Adobe doc answers your question. Your only approach is to install fresh AEM 184.108.40.206 and then install your packages on it (your content and apps) - as Gaurav points out.
I assume you have all your code/content in a tool like Github. You can re-install on AEM 220.127.116.11.
It is possible to down grade but it is not recommended to downgrade. Safer solution would be do a fresh install and patch to the level you want.
Usually UNIX / Infra team runs CURL scripts to install SP/CFP on servers, if you want to downgrade the version UNIX can go into install folder under crx/quickstart folder and they can take it out (SP/CFP).